25555656 has 96 divisors (see below), whose sum is σ = 76826880. Its totient is φ = 7056000.

The previous prime is 25555643. The next prime is 25555661. The reversal of 25555656 is 65655552.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36106 + ... + 36806.

It is an arithmetic number, because the mean of its divisors is an integer number (800280).

Almost surely, 2^25555656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25555656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38413440).

25555656 is an abundant number, since it is smaller than the sum of its proper divisors (51271224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25555656 is a wasteful number, since it uses less digits than its factorization.

25555656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755 (or 744 counting only the distinct ones).

The product of its digits is 225000, while the sum is 39.

The square root of 25555656 is about 5055.2602306904. The cubic root of 25555656 is about 294.5522499852.

The spelling of 25555656 in words is "twenty-five million, five hundred fifty-five thousand, six hundred fifty-six".